A view of a .45 semi-auto handgun on display at the National Rifle Association Annual Convention on May 4 in Houston. The NRA opened its annual convention May 3 in combative style, positioning itself as champion of American freedoms in the face of growing pressure for tougher gun laws. Karen Bleier, AFP/Getty Images

An young attendee inspects an assault rifle. More than 70,000 people are expected to attend the three-day annual meeting that features nearly 550 exhibitors, gun trade show and a political rally. Justin Sullivan, Getty Images

A protester holds a sign during a demonstration in favor of gun regulation outside of the convention center. Justin Sullivan, Getty Images